<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style>
        table {
            height: 500px;
            width: 500px;
        }

        table .t1 {
            height: 100px;
            width: 100px;
            background-color: red;
        }

        table .t2 {
            height: 100px;
            width: 100px;
            background-color: blue;
        }

        table .t2 .none {
            background-color: white;
        }

        table .t3 {
            height: 100px;
            width: 100px;
            background-color: green;
        }
    </style>
</head>
<body>
<?php
echo <<<test
<table>
    <tr class="t1">
        <td></td>
        <td></td>
        <td></td>
    </tr>
    <tr class="t2">
        <td></td>
        <td class="none"></td>
        <td></td>
    </tr>
    <tr class="t3">
        <td></td>
        <td></td>
        <td></td>
    </tr>
</table>
test;
?>
</body>
</html>